I don't recall seeing any mention of this in the thread or even speculation that this might happen, but apparently GE kiosks have already been installed at YVR and YOW CBP pre-clearance facilities with YUL and YYZ coming on line by September. I assume more will be added, perhaps Dublin and some other airports in Canada. I don't see this going to places like BDA or NAS. Also, no benefits when entering Canada unless you're a NEXUS member who has gone through the Canadian border patrol formalities.

I won't paste the the text of it, but here's a link to yesterday's press release on the topic:
http://www.cbp.gov/xp/cgov/newsroom/...l/07262011.xml

Fantastic news!